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Патент USA US2118242

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May 24, 1938.
I. THOMAS
2,118,242
LATCH FOR CASING CUTTERS AND THE LIKE
Filed May 11, 1936
>
2 Sheets-Sheet 1
May 24, 1938.
2,1 18,242
l. THOMAS _
LATCH FOR CASING CUTTERS AND THE LIKE
Filed May 11, 1956
2 Sheets-Sheet 2
INVENTOR.
QMamm),
BY’
I
l
‘Patented May 24, '938
2,118,242 .
UNITED’ STATES ‘PATIENT
OFFICE
2,118,242
LATCH FOR CASING CUTTERS AND THE
I
LIKE
'
Idris Thomas, Whittier, Calif.‘
Application May 11, 1936, Serial No. 79,037 .
12 Claims.
This invention is a latch for securing cooper
ating elements against relative longitudinal dis?
placement, the latch being readily releasable by
(oi. 164--0.8)
partly in axial section, showing the latch incor
porated therein for securing a well string against
longitudinal displacement with relation to the
.
relative rotation of the elements. The invention mechanism which expands the cutter blades.
Fig. 2 is a similar view with the latch released 5
5 is particularly applicable to oil well tools wherein
actuating mechanism which is supported by a and the cutter blades expanded.
Fig. 3 is a side elevation of a packer, partly in
well string, e. g. mechanism for expanding'slipsl
axial section, showing the latch incorporated
or the like, is inoperative when held against lon
gitudinal displacement relative to the well string therein for securing a well string against longi- v
10 but is operativev when longitudinally displaced tudinal displacement with relation to the actuat- 10
relative thereto, the latch h0lding~the actuating ing mechanism for the packer.
mechanism ‘against longitudinal displacement
relative to the well “string while the latter is
being run in a well, but being readily releasable
15 by rotating the well string, to permit longitudi
nal displacement of the well string with relation
to the actuating mechanism for operating the
latter.
2
'
,
Fig. 4 is a similar view of‘ a spear for support
ing a well string in a well, with the latch incor
porated therein for releasably holding the spear
against operation.
'
15
Fig. 5 is a similar View of a spear for use in -
?shing jobs and the like.
Fig. 6 is a similar view of a socket for ?shing
.
It is an object of ‘the invention to provide a
latch for the purpose .described, which is of ex
tremely simple construction' but positive in op-~
eration, and which is readily releasable by rotat
ing the well string. ,
-
It is a further object of the invention to pro
vide a latch which, subsequent to release and
jobs, etc. ~
'
In each of the illustrated embodiments of the N) 0
invention, the latch is employed between a well
string and a. cooperating actuating mechanism
which is run into the wellv on the well string, with
release, of the latch permitting longitudinal dis
and thus again secure the actuating mechanism
placement of the well string with relation to the’
actuating mechanism whereby the actuating
mechanism functions for any particular purpose
for which it is designed.
The latch is particulary applicable to a casing
in its inoperative position, merely by longitudi
nally shifting the well-string in the opposite di
cutter such as shown at Figs. 1 and 2, in which
embodiment of the invention spring means are
relative longitudinal displacement of the well
string for operating the actuating mechanism,
is adapted to again provide a locking engagement
included in the actuating mechanism, cooperat
rection with relation to the actuating mecha
nism. The actuating mechanism may thus be ing with the latch to insure positive operation of
operated. at any desired level in a, well by the tool. As an instance of this‘arrangement the
rotating the well string and longitudinally shift . casing cutter may be incorporated in a- well string
-ing the well string in one direction, and then 2, and the actuating mechanism for the casing
by merely longitudinally shifting the well string cutter comprises a downwardly ‘tapering wedging
in the opposite direction the actuating mecha
sleeve 3 slidable on a mandrel 4, with slips 5 coop
erating with the sleeve for anchoring the sleeve, in
nism may be again secured in its inoperative po
40 sition, whereby the well string may be raised or the casing by‘ downward movement of the sleeve 40
lowered and the actuating mechanism then again with relation to the slips. When'the wedging
operated at any desired level in the well.
sleeve has been anchored, downward movement of
It is a still lfurther object of the invention to » the well string relative thereto causes ?ngers 6 to
provide a construction whereby relative rotation engage and expand the blades 1 of the cutter
45 of the well string --in one direction releases the which are mounted on the mandrel 4, and this rel
latch ‘as previously described, but the well string ' ative displacement of the mandrel, sleeve and slips
may be freely rotated in \the opposite direction
is controlled by a latch which is provided between
with relation to'the latch structure without re
leasing the actuating mechanism and without lia
60 bility of jamming the parts so as to render the
the mandrel 4 and a sleeve 8 on which the slips
device inoperative.
_
-
Further objects of the invention will be readily
‘understood from the following description of the
accompanying drawings, in which:
65
Fig. 1 is a side elevation of a casing cutter,
are mounted.
,
'
The latch, when engaged as shown at Fig. 1,
locks‘the sleeve 8 against longitudinal displace
-ment on the mandrel 4, thereby holding the slips
5 in retracted inoperative position with relation
to the wedging sleeve 3, and the latch is released
by turning the well string and its depending 56
2,118,242
transverse abutment surface 33 for prevent
‘mandrel 4 with relation to the sleeve 18., When the
ing relative longitudinal displacement in one di
‘ the latch has been released the well string is low
ered, whereby the mandrel 4 shifts the sleeve'3
rection between the pawl and the thread, except
panding the slips and thereby anchoring‘ the
tive rotation of said parts; and the head of the
pawl has a lower inclined surface 35 adapted to
engage the inclined surface 32 of thethread,
{whereby the pawl and thread are free for rela
downwardly with relation to the slips 5 for ex- ‘ by screwing the pawl along the thread by rela- ,
sleeve 3, and continued downward movement of
the well string then slides the mandrel 4 through
the anchored sleeve until the blades 1 are en
gaged/and expanded by the ?ngers G as shown ‘ tive longitudinal displacement in the opposite di
rection, without relative rotation of the parts but
10 j at Fig. 2.
The mandrel 4 may be suspended from the well I merely by the pawl retracting against the ten
string 2 by a usual threaded joint l0, and the sion of its spring 3| as its inclined surface 35
upper end of the mandrel may have a plurality I slides over the inclined surface 32 of the thread.
of recesses H in which the blades 1 are pivoted
15 for normal retraction by springs l2, ‘with the
With the latch operatively engaged as shown at
Fig. 1, the parts are held in position with the slips 15
5 inoperatively retracted with relation to the
sleeve
'3 and with the ?ngers 6 inoperatively re
ing surfaces l3 which are adapted for engage
ment by the ?ngers 6 for operatively projecting , tracted with relation to the cutter blades 1, and
swinging ends of the blades provided with wedg
the blades. Below the recesses II the mandrel - with an extension 40 of the sleeve 3 abutting the
upper end of the collar 26. The casing cutter, 20
20 4 may be of reduced diameter, with the ?ngers 6
suspended from the well string 2, may thus be
preferably projecting longitudinally from a col
lar l4 which is slidable on this reduced diameter lowered into a well to any desired level, with the
of the mandrel, and with the ?ngers 6 preferably
seating in grooves IS in the mandrel, permitting
' relative longitudinal movement of the ?nger sup
friction springs 24 readily yielding‘ to permit
lowering of the tool through the well casing. '
' When the tool is at the desired level, the well
string is rotated as indicated by arrow A, i..e. in
the normal direction of rotation of a well string
having a usual right-hand thread; and the thread
Spring means cooperate with the latch mech
anism, to positively retract the ?ngers 6 when 25 being in the same direction, i. e., a right-hand
' the latch is engaged, and to permit operative pro ' thread, and the springs 24 frictionally engaging
jection of the ?ngers and tension the gripping , the casing so as to hold the sleeve 8 against ro
engagement by the slips when the latch has been tation, relative turning movement of the mandrel
porting collar I4 while maintaining alinement
' ofv the ?ngers 6 with the respective blades 1.
4 screws the pawl 29 along the thread, 25 until
released. For this purpose the collar i4 is sup
upper end of the thread clears the pawl, there
ported on the sleeve 3, with springs 9 seating in the
recesses 16 in the mandrel 4 and engaging pins ll by releasing the latching engagament; If the
which project upwardly from the collar I4‘; and ,well string should have a left-hand thread, so
Ya spring I8 is mounted in a counterbore of the
sleeve 3, with the lower end of the spring engag
ing the end of said counterbore and with the up
40 per end of the spring engaging an anti-friction
bearing I9 which preferably longitudinally abuts
a shoulder 20 of the mandrel.
’
The slips 5 preferably have dove-tail connec
tions 2| with downwardly tapering wedging sur
45 faces 22 of the sleeve 3, and may be supported on
the sleeve 8 by link connections 23. The sleeve 8
is ‘provided with frictional elements, shown as
bowed spring 24, connected at their lower ends to
the sleeve 8 and connected at their upper ends to
50 a collar 25 which is slidable on the sleeve 3; and
the springs 24 are adapted to yieldingly engage
the wall of a well bore into which the tool is
lowered, for frictionally holding the sleeve 8
‘against rotation in the well bore.
The latch which is provided between the man
55 drel
4 and the sleeve 8, includes a trapezoidal
thread 25 on one of these relatively displaceable
cooperating elements, with a cooperating pawl 29
on the other of said cooperating elements.
In the illustrated embodiment, the trapezoidal
60
thread :25 is formed at the outer periphery of a
collar 28 which is preferably threaded onto the
lower end of the mandrel 4 as shown at 21 and
»which forms a prolongation of the mandrel 4,
preferably terminating in a head 28. The co _
operating pawl 29 is an upstanding pawl pivoted
at its lower end in a slot 38 in the sleeve 8, with
a head at the upper endsof the pawl yieldingly
spring projected as shown at 3|, for releasable
70 engagement with the thread 25. The upper sur
face of the trapezoidal thread is steeply inclined
that its normal direction of rotation is in the re
verse direction, a latch would be provided having
a‘ corresponding left-hand thread. The sleeve 8
being held against downward displacement in the
casing by means of its friction springs 24, the
well string and the suspended mandrel 4 may be
40
lowered relative to the sleeve 8, thereby expand
ing the slips 5 on-the wedging surfaces 22 so as
to anchor the sleeve 3, with the compressed spring .
l8 urging relative longitudinal movement of the
slips and sleeve for tightening the gripping en
gagement by the slips, and by continuing the
downward movement of the well string and its
suspended mandrel with relation to the anchored
sleeve, the springs 3 yield so that the ?ngers‘ 8
engage and operatively expand the blades 1.
The parts then being in the position shown at
Fig.‘ 2, the well string and its suspended mandrel
together with the blades 1.. and the collar l4, may
be rotated relative to the anchored sleeves 3 and '
8, for cutting the well casing by means of the
blades ‘|._
,
l
. By then merely elevating the well string and
its suspended mandrel, the parts are returned to
their original inoperative position as shown at, M
Fig. 1, with the spring I8 downwardly displac
ing the sleeve 3 on the mandrel 4, so that the
springs -9 may retract the collar l4 to disengage
the ?ngers 6 from_.the blade's ‘I. The pawl 29
readily yields to clear the thread 25 during rela
tive longitudinal movement betweenthe mandrel
4 and the sleeve 8, and the pawl then automati
cally reengages the cooperating thread to pro
vide a latch, without it having been necessaryto
reversely rotate the well string to thus reeng'age' 70
the latch. The tool may then be lowered with
. as shown at 32, with the lower surface of the , the latch again retaining the actuating mech
thread forming a transverse abutment surface anism in inoperative position, and the cutter may
33. The head at the upper end of the pawl has their again be operated at any lower level in_ the
75
an upper abutment surface 34 adapted to emage
we
:
.
~
2,113,242
In order to limit relative longitudinal displace
ment between the mandrel 4 and the sleeve 8
while the well string is being withdrawn from a
well, the head 28 may form an abutment shoulder
4| which is adapted for engagement by the lower
end of the sleeve 8; and means are preferably
provided whereby if for any reason the tool is
rotated in the opposite direction to that of ar
row A, so that the pawl 29 is screwed downwardly
10 along the thread 25, this threaded movement is
arrested before the screw action has jammedythe
endof the sleeve 8 against the shoulder 4i, as
might otherwise so tighten the threaded ‘engage
".20
1
3
Theoperation is the same as that previously
described in connection with Figs. 1 and 2.
While the packer is being lowered into a'well the
latch secures the mandrel 4a and the wedging
sleeve 30. against downward displacement with
relation to the sleeve 8a and the slips 5a, where
by the slips are inoperatively retracted as shown
at Fig. 3. When the packer is to be operatively
expanded, the well string and the mandrel 4a
which is ?xed thereto are rotated in the direc 10
tion of arrow A’, and the sleeve 8a being held
against rotation by its springs 24a, the pawl 29a
is screwed along the thread 25a so as to ?nally
ment as to make it impossible to subsequently clear the upper end of the thread and thus re
lower the mandrel 4 with relation to the sleeve lease the latch. Downward movement of the 15
8 for operating the tool. ,As an instance of this well string with relation to the frictionally held
arrangement the lower end of the thread 25 may sleeve 8a, then expands the slips 5a to anchor
merge into the surface of the collar 26, in such . the sleeve 3a, and continued downward move
spaced relation from the shoulder 4| that when ment of the well string then compresses the
the pawl 29 is at the lower end of the thread as packing rubber 50 against the anchored sleeve '20
So, so as to operatively expand the packing rub
shown at Fig. 1, there is a clearance space be
tween the shoulder “ and the lower end of the
ber.
_
-
.
thread and merely idle on the surface of the
Subsequent elevation of the well string, without
the necessity of rotating the same, and whereby
the pawl 29a yields to clear the thread 250. and
collar 26 and thus discontinue the threaded lon
then automaticallyreengages the thread as shown
sleeve 8. Therefore if the pawl is screwed down
wardly along the thread it will ?nally clear the
.25
gitudinal displacement of the mandrel 4 with ’ at Fig. 3, again secures the actuating mechanism
relation to the sleeve 8 before the sleeve 8 jams
against the shoulder 4|.
At Fig. 3, I have shown the latch embodied in a
30
packer for a well, for releasably securing the
packer actuating mechanism in its inoperative
position. ,The packer is incorporated in a well
string, and includes a downwardly tapering
wedging sleeve ‘as, slidable on a mandrel 4a which
supports a packing rubber 50, with slips 5a ‘co
in its inoperative position whereby the packer
may be lowered to any other level in the well
and then again operated; or the packer may be
withdrawn from the well, with the shoulder 4la
so
engaging the sleeve 80. to limit relative longi
tudinal displacement of the parts. If the well
string is reversely rotated, the pawl 29a. idles
on ‘the surface of that portion. of the mandrel
4a which is below the thread 25a and which is
operating with the sleeve for anchoring the sleeve ' shown at 26a, to prevent the screw. action tightly
in a well by downward movement of the sleeve
with relation to the slips. When the sleeve So
40 has been anchored, downward movement, of the
well string relative thereto compresses the pack
ing rubber against the anchored sleeve for op
eratively expanding the packing rubber.
jamming the sleeve 8a against the shoulder 41a.
At Fig. 4, I have shown a latch such as pre
viously described, incorporated in a spear for
supporting a well string 2b in a well bore. The
spear includes a mandrel 4b suspended from the
well string and having downwardly tapering
and may be supported on the sleeve 8a by means
wedging surfaces 22b, with a sleeve 8b which
is slldable on the mandrel 4b, forming a cage 45
for slips 5b, which are operatively expanded by
downward movement of the wedging surfaces
22b with relation to the slips. Springs 24?)
of bowed friction springs 240 which are adapted
50 to yieldingly engage the wall of the well bore
for irictionally holding the sleeve 8a against ro
which are mounted on the sleeve 8b, yieldingly
engage the wall of the well bore for frictionally 50
holding the sleeve against rotation in the well;
The slips 5a are mounted on a sleeve 8a which
45
is slidable on the mandrel 4a, and preferably
have dove-tall connections 2la with downwardly
tapering wedging surfaces 22a of the sleeve 3a,
tation therein.
As an instance of this arrange
ment, the friction springs maybe connected at
their lower ends to the sleeve 8a, with their up
55 per ends connected to a collar 25a which is slid
so
and the latch is provided between the mandrel
4b and the sleeve 8b. The trapezoidal thread 25b
is formed on a collar 26b‘ which: is suspended
from the mandrel. 4b and which terminates in a .
able on the mandrel 4a, and a collar 52 may rest‘
upon the collar 25a, with link connections 23a
between the collar 52 and the slips 5a.
A latch such as previously described in con
nection with Figs. 1 and 2 is provided between
head ‘28b forming an abutment shoulder Mb for
the sleeve 8a 'and the mandrel 4a, the trapezoidal
the latch secures the mandrel 4b and the sleeve
the sleeve 8b, and the cooperating pawl 29b is'
pivoted in the sleeve 8b and is yieldingly opera
tively projectedby a spring 3lb.
‘ While the spear is being lowered into a well 60
thread 25a of the latch being formed on the
8b against relative longitudinal displacement so
mandrel, and the cooperating pawl 291: being
that the slips 5b are retracted with relation to‘
the wedging surfaces MD, as shown at Fig. 4; and
when the spear is to be operated the well string 65
at the» lower end of the mandrel ‘4a and which ' 2b is rotated as shown by arrow A2, screwing the
pawl 29b along its cooperating thread 25b so. as
provides for connecting the packer to a depend
\ ing length of the wellqstring (not shown), fbrms to clear the upper end of the thread, whereupon
an abutment shoulder 4ia which is adapted for the well string may be lowered relative to the
70 engagement by the lower end of the sleeve 8a, frictionally held sleeve" 8b for operatively ex 70
and the lower end of the thread 25a terminates panding the slips 5b. Upward movement of the
in such spaced relation from the shoulder 4|a well string, without rotation thereof, reengages.
that when the pawl 29a is at the lower end of the the latch, with the slips 5b again retracted-as thread, there is a- clearance space between the shown at Fig. 4, so that th pear may’be lowered
pivoted in- the sleeve 8a and being yieldingly op
65 eratively projected by a spring Ma. , A collar 28a
shoulder 4 la and the sleeve. 8a.
.to' adi?erent level; or the s var may be with 75
4
2,118,242
At Fig. 6, I have shown the latch incorporated
drawn with the sleeve 8b engaging the shoulder
llb to limit relative longitudinal displacement
of the parts.
in a socket which may be run into a well on a
string id in order to slip over any element which
it is desired to withdraw from the well, the socket
At Fig, 5, I have shown the latch incorporated I
in a spear which may be run into a well ‘on a
suitable well string 20, to engage the bore of a
tubular element which it is desired to with
being set in the same manner'as that of the spear
shown at Fig. 5, i. e. by upward movement of
the well string with relation to the slips 5d ‘of
the socket, and the slips being released and the
draw from the well, the construction and opera
latch reengaged by relative downward move
tion of the spear being the reverse of the spear
10 shown at Fig. 4, i. e. the spear being set by up
ward movement of the well string 20 with rela
tion to its slips 50, instead of by downward
movement of the well string, and the slips 50 be
ment of the well string.
string.
‘
c
10
may depend from the well string 2d with down
wardly tapering wedging surfaces 22d in the
bore of the sleeve, and the slips 5d which are
ing released and the latch again operatively
engaged, by relative downward movement of the
well
-
As an instance of this arrangement a sleeve 811
adapted for operative contraction around the
element which is to be recovered from the well,
cooperate with the wedging surfaces 22d and
I
As an instance of this arrangement a mandrel
are mounted in a cage 60.
4c is suspended from the well string 20, and
This cage is sus
pended from a mandrel 4d which is mounted in
the bore of the sleeve 81:! so as to permit rota 20
tion and longitudinal displacement of the sleeve
with relation to the mandrel and the slips. 'The
latch is provided betweemthe mandrel 4d and
the sleeve 8d, and includes a trapezoidal thread
25d on the mandrel and a cooperating upstand 25
upwardly tapering wedging surfaces 220 on the
mandrel, cooperate with slips 5c which are
, mounted in a sleeve 80 which forms a cage for
the slips. ,The latch between the mandrel 4c
and the sleeve 80 includes a trapezoidal thread
250 on the mandrel and a cooperating spring
25 projected pawl 29c pivoted at its upper end in
ing spring projected pawl 29d pivoted at its
the sleeve and having a depending head, with the
lower end in the sleeve and having a head at its
that of the threads of the latches which are shown upper end. The pitch of the thread is in the
at Figs. 1 to 4, so that with the sleeve 8c held same direction as that of the latch shown’ at
30 against rotation and the well string rotated in - Fig. 5, i. e. in the opposite direction to that 30
at Figs. 1 to 4, so that with the mandrel
the direction of arrow A3, the pawl 29c is shown
4d held against rotation and the well string
screwed downwardly along the'thread. The up
per surface of the thread and the lower surface turned in the direction of arrow A4, the pawl N11
of the head of the pawl form the cooperating flat is screwed upwardly along the thread. The co
operating surfaces of the ‘thread and the head 35
35 abutment surfaces 33c-—34_c, and the lower sur
face of the thread and the upper surface of the of the pawl are arranged the same as shown at
Figs. 1 to 4, i. c. with the ?at abutment surfaces
head of the pawl form the cooperating steeply in
clined surfaces 32c—35c. Springs 240 on the “(L-34d at the lower surface'of the thread
and ‘at the upper surface of the head of the pawl,
sleeve 8c frictionally hold'the sleeve against rota
and with the inclined surfaces 32d-35d at the
40 tion in the tubular element into which the spear
upper surface of ‘the thread and at the lower
‘is lowered; and the mandrel 40 forms an abut
ment shoulder llc above the sleeve 80, with the surface of the head of the pawl. Springs lid
upper end of the thread 250 terminating in such in the bore of the cage 60 "frictionally hold the
spaced relation from the shoulder lie that in the ‘ cage and the mandrel 401 against rotation on the
element over which the socket is lowered; and
45 event of reverse rotation of the well string, the
pawl 290 will be screwed off the upper end of the the sleeve 8d has an abutment shoulder Md in
its bore, above the mandrel 4d, with the thread
.thread and thus interrupt the screw action be
fore it jams the sleeve 80 against the shoulder 25d terminating at its lower end at such point
‘that in the event of reverse rotation of the Well
“c.
. In operation the latch holds the sleeve 80 string, the pawl 29d will be'screwed off the lower
against downward movement on the mandrel 4c end of the thread and thus interrupt the screw
and the shoulder llc limits upward movement action before it jams the mandrel 4d against
pitch of the thread in the opposite direction to
a
of the sleeve on the'mandrel while the spear ‘is
being lowered, and when the spear is' in place
in the tubular element which it is to engage,
the springs 24c hold the sleeve 80 against rota
tion and the well string 2c is rotated in the
direction of arrow A3. The latch as described is
for a well string having a right-hand thread, and
(30 the thread 250 is in the opposite direction if
the well string has a left-hand thread so that
left-hand rotation of the well string will operate
the tool. The pawl 28c is thus screwed along the
thread 250 to clear the lower end of the thread
and release the latch, and upward movement‘
of the well string with relation to the frictionally
held sleeve 8c then expands the slips 5c to grip
the tubular element which_is to be withdrawn
from the well. To release the spear the well
the shoulder “11.
g
'
In operation the latch holds the mandrel 4d
and the slip cage 60 against downward move 55
ment in the sleeve 0d so ‘that the slips are inoper
atively expanded while the socket is being lowered
in a well; and when the socket has been slipped
over an element which is to be recovered from
the well, the springs 24d hold'the mandrel and 60
slip cage against rotation so that turning the
well string in the direction of arrow A4 screws the
pawl 29d along the thread 25d until it clears the
upper end of the thread. The latch is oppositely
threaded and vthe well string is oppositely rotated
if the well string has a left-hand thread. The
latch being thus released, the well'string may be
elevated withyrelation to the frictionally held slip
cage so as to set the slips by means of the wedg
then reengaging the thread when the parts are
in'g surfaces 22d, whereupon the socket and the 70
element which has been gripped thereby, may be
withdrawn from the well. Downward movement
again in inoperative position as shown at Fig.’ 5,
without requiring rotation of the well string
75 while the latch is being thus reengaged.
of the well string and the sleeve 8d relative to the
operated slip structure, returns the parts to in
operative position as shown "at Fig. 6, with the 76
string is lowered relative to the sleeve 80, the.
pawl 29c yielding to clear the thread 25c and
2,118,242,.
5
,
pawl 29d yielding to clear the threads 25d with~' surface of. the threaded support before the co
operating abutments engage.
,
.
out the necessity of rotating the well string."v
2. In a cutter for casing, a support, a cutter
The invention is thus applicable toyany tele
scopic elements which it is desired to releasably
secure against relative longitudinal displacement,
’ with the securing means releasable by rotating one
of said elements with relation to the other, and
on the support, a slip, a wedge movable relative
to the slip for engaging the slip with casing, an
expander for the cutter supported by the wedge,
the wedge and the expander being movable rela
tive to‘ the support, yieldable means for, rela
readily reengaged by merely telescoping the ele ' tively moving the expander and the support so
ments without relative rotation thereof. The in
as to disengage the expander‘ from the cutter,
10 vention is thus ,particularly applicable to oil well
tensioning means for relatively 'moving the wedge
tools, wherein a casing cutter, packer; ?shing tool
and the support so as to tighten engagement of
or the like is lowered into a well and is then set ‘ the slip with the casing, a support for the slip slid
by relative longitudinal displacement of the well
string on which the tool is mounted; the inven
15 tion providing for securing the well string and
able relative to the ?rst mentioned support,alatch
between the supports comprising a cooperating
the actuating mechanism against relative longie
ing the pawl for engaging the thread so as to be
pawl and thread, means for yieldingly project
tudinal displacement so that the actuating mech , screwed therealong and thus relatively longi
anism remains inoperative while the tool is being tudinally displace the supports by relative rota
lowered, with rotation of the well string from tion thereof, the thread and pawl having co 20
20 the top of the well‘ then releasing the securing
operating surfaces securing the supports against
relative longitudinal displacement in one direc
means whereby the well string may be longi
tudinally displaced with relation to the actuat
tion except by their relative ‘rotation, relative
ing mechanism for setting the tool, and the tool longitudinal displacement of. the supports in said
direction anchoring the expander and opera 25
25 being retracted to its inoperative position and the
securing means being then reengaged, by merely tively projecting the cutter, the thread and pawl
shifting the well string in the opposite directionv having cooperating surfaces adapted to dis
engage the pawl from thethread to permit rela
with relation to the actuating mechanism and
without the necessity of ‘rotating the well string. tive longitudinal displacement of the supports in
invention also provides for limiting relative the opposite direction, relative longitudinal'dis 30
so The
longitudinal displacement of the well string and placement of the supports in said opposite direc
the actuating mechanism in the direction oppo
site to that which sets the tool, and provides a
construction wherein relative rotation of the well
string in the direction opposite to that which
releases the latch, cannot jam the parts so as to
render the latch inoperable.
I claim:
‘ 1. In a cutter for casing, a support, a cutter
40 on the support, a slip, a wedge movable relative
to the slip for engaging the slip with casing, an
expander for the cutter supported by the wedge,
the wedge, and the expander being movable rela
tive to the support, yieldable means for relatively
45 moving the expander and the support so as to
disengage the expander from the cutter, tension
ing means for relatively moving the wedge and
the support so as to tighten engagement of. the
slip with the‘ casing, a support for the slip slid
50 able relative to the ?rst mentioned support, a
latch between the supports comprising a cooper
ating thread and pivoted pawl, means for yield
ingly projecting the pivoted pawl for engaging
the thread so as to be screwed therealong and
55 thus relatively longitudinally displace the sup
ports by relative rotation thereof, the thread and
pawl having cooperating surfaces securing the
supports against relative longitudinal displace
tion releasing the anchored expander, and co
operating abutm‘ents on the supports for limiting
their relative longitudinal displacement in the
last mentioned direction, the thread terminating 35
at such point that when the supports are‘ rela
tively longitudinally displaced in said last men
tioned direction the pawl clears the end of the
thread and idles on the surface of the threaded
support before the cooperating abutments en
gage-
'
,
3. In a cutter for casing, a support, a cutter
on the support, a support slidable relative to the
?rst mentioned support, an expander carried by
the slidable support, a latch between the sup
ports comprising a cooperating thread and pawl,
means for yieldingly projecting the pawl for en
gaging the thread soas to be screwed therealong
and thus relatively longitudinally displace the
supports byrelative rotation thereof, the thread 50
and pawl having cooperating surfaces securing
the supports against relative longitudinal dis
placement in one direction except by their rela
tive‘ rotation, relative longitudinal displacement
of the supports in said direction engaging the 55
cutter by the expander for operatively projecting
the cutter, the thread and pawl having cooperat
ing surfaces adapted to disengage the pawl from '
the thread to permit relative longitudinal dis
ment in one direction except by their relative
60
60 rotationjelative longitudinal displacement of the . placement of the supports in the opposite direc
tion, relative longitudinal displacement of the
supports in said direction anchoring the expandera supports in said opposite direction disengaging
and operatively projecting the cutter, the thread
expander from the cutter to permit return of‘
and pawl having cooperating surfaces adapted to the
said cutter to inoperative position, and cooperat
‘disengage the pivoted pawl from the thread to
65
permit relative longitudinal displacement of the
supports in the opposite direction, relative longi
tudinal displacement of the supports in said op
posite direction releasing the anchored expander,
and cooperating abutments on the supports for
70 limiting their relative longitudinal displacement
in the last mentioned direction, the thread
terminating at such point ‘that whenthe sup
ports are relatively longitudinally‘ displaced in
said last mentioned direction the pivoted pawl
76, clears the end of the thread and idles 0n the
ing abutments on the supports for limiting their 65
relative longitudinal displacement in the last
mentioned direction, the thread being arranged
whereby that threaded movement of the pawl
along the thread which causes relative longitudi
nal displacement of the supports in said last men 70
tioned direction terminates before the cooperat
ing abutments engage.
‘
‘
4. In a well tool, a support adapted for incor
poration in a well string, a support slidable rela
tive to the ?rst mentioned support, an element 75
6
2,118,242
on one of said supports adapted for projection
to position de?ning operative position of the tool,
an expander carried by the other support, a latch
between the supports comprising a cooperating
thread and pawl, means for yieldingly project-_
ing the pawl for engaging the thread so as to be
screwed therealong and thus relatively longitudi
nally displace the supports ‘by relative rotation
thereof, the thread and pawl having cooperating
surfaces securing the supports against relative
longitudinal displacement in one direction except
by theinrelative rotation, relative longitudinal
displacement of the supports in said direction en
gaging the aforesaid element by the expander
16 for operatively projecting said element, the thread
and pawl having cooperating surfaces adapted
to disengage the pawl from the thread» to permit
relative longitudinal displacement of the sup
ports in the opposite direction, relative longitudi
nal displacement of the supports in said opposite
direction disengaging the expander from the
and pawl having cooperating surfaces adapted to
disengage the pawl from the thread to permit
relative longitudinal displacement of the supports
in the opposite direction, relative longitudinal
displacement of the supports'in said opposite di
rection disengaging the expander from the afore
said element to permit return of said element to >
inoperative position, means for frictlonally hold
ing one of said supports against rotation.
'7. In a well tool, a support adapted for incor 10
poration in a well string, a support slidable rela
tive to the ?rst mentioned support, an element on
one'of said supports adapted for projection to
position de?ning operative position of the tool, _
an expander carried by the other support, a'latch 15
between the supports comprising a cooperating
thread and pawl, means for yieldingly projecting
the pawl. for engaging the thread so as to be,‘
screwed therealong and thus relatively longitu
dinally displace the supports by relative rotation
thereof, the thread and pawl having cooperating
surfaces securing the supports against relative
aforesaid element to permit return of said ele
ment to inoperative position, cooperating abut- “ longitudinal displacement in one direction except
'ments on the supports for limiting their relative by theirrelati've rotation, the thread and pawl
longitudinal displacement in the last mentioned having cooperating surfaces adapted to disengage
direction, the thread being arranged whereby the pawl from the thread to permit relative lon
that threaded movement of\the pawl along the ' gitudinal displacement of the supports in the op
posite direction, the aforesaid element and the
thread which causes relative longitudinal dis
placement of the supports in said last mentioned expander being arranged whereby relative longi
tudinal displacement of the supports in one di
direction terminates before the cooperating abut
rection engages said element by the expander for
ments engage.
'
5. In a well tool, a support adapted for incor- ' operatively projecting said element and relative
longitudinal displacement of the supports in the
poration in a well string,v a support slidable rela
tive to the ?rst mentioned support, an element on opposite direction disengages the expander from
one of said supportsgadapted for projection to. said element to permit return of said element to
position de?ning operative position of the tool, an inoperative position, and cooperating abutments
expander carried by the other support, and a on the supports for limiting their relative longi
tudinal displacement in one direction, the thread
latch between the supports comprising a cooper
ating thread ‘and pawl, means for yieldingly pro
jecting the pawl for engaging the thread so as to
be screwed therealong and thus relatively longi
tudinally displace the supports by relative rota
tion thereof, the thread and pawl having cooper
ating surfaces securing the supports against rela
tive longitudinal displacement in one direction ex
20
25
30
being arranged whereby that threaded move- ,
ment of the pawl along the thread which causes 40
relative longitudinal displacement of the supports
in saidlast mentioned direction terminates be
fore the cooperating abutments engage; '
8. In a well tool, a support adapted for incor
poration in a well string, a support slidable rela 46
tive to the ?rst mentioned support, an element
on one of said supports adapted for projection
cept by their, relative rotation, relative longitudi
nal displacement of the supports in said direction
engaging the aforesaid element by the expander
for oper'atively projecting said element, the thread
to position de?ning operative position of the tool,
and ‘pawl having cooperating surfaces adapted
a latch between the supports, comprising a coop 50
to disengage the 'pawl from the thread to permit/
relative longitudinal displacement of the supports
in the opposite direction, relative longitudinal
erating thread and pawl, means for yieldingly
projecting the pawl for engaging the thread so
as to be screwed therealong and thus relatively
displacement 'of‘ the supports in said opposite di
rection disengaging the expander from the afore
said element to permit return'of said element to
longitudinally displace the supports by relative
rotation thereof, the thread and pawl having co 55.
operating surfaces securing the supports against
relative longitudinal displacement in one direc
tion except byjtheir relative rotation, the thread
and pawl having cooperating surfaces adapted to
disengage the pawl from the thread to permit
relative longitudinal displacement of the supports
in the opposite direction, the aforesaid element
inoperative position.
\
_.
»
,
Y
_ 6. In a well too], a support adapted for incor
poration in a well string, a support slidable (rela
tive to the ?rst mentioned support, an element on
. one of said supports adapted for projection to
position de?ning operative position of the tool,
an expander carried by the other support, a- latch
between the supports comprising a cooperating
thread and pawl, means for yieldingly projecting
the pawl for engaging the thread so as to be.
an expander carried by the other support, and
and the expander being arranged whereby rela
tive longitudinal displacement of the supports in
one direction engages said element by the ex
- screwedtherealong and-thus relatively longitudia
_ nally displace the supports by relative rotation
pander for operatively projecting said element
and relative longitudinal displacement of\ the
supports in the opposite, direction disengageii‘he
thereof, the thread and pawl having cooperating
expander from said element to permit return of
70 ‘surfaces securing the supports‘ against relative
longitudinal displacement in one direction except
ly-etheir relativerotation, relative longitudinal
displacement of the supports in said direction
engaging-the aforesaid element by the expander
for operatively projecting said element, the thread
said element to inoperative position.
,
. ,
9. In a well tool, a support’ adapted for incor
poration in a well string, a support slidable rela
tive to the ?rst mentioned support, an element
on one of said supports adapted for projection
to position de?ning operative position of the tool,
85
7
9,1 113,242
an expander carriedbyi'the'other support, a latch / ‘of the supports in said last mentioned direction
between the- supports comprising a cooperating terminates before the cooperating abutments en
thread and pawl, means. for yleldingly‘ projecting
gage.
'
the pawl for engaging/the thread so as to be
11. In a well tool, a support adapted for incor
' screwed therealong, and thus relatively longitu
poration in a well string, a support slidable rela
dinally displace the. supports by relative rotation ' tive to the ?rst mentioned support, an element
thereof ,, the thread “and. pawl; having cooperating on‘ one of said supports adapted for projection
10'
surfaces‘ securing, the supports against relative
to position de?ning operative position of the tool,
longitudinal displacement in one direction except
an expander carried by the other support, a coop
by their‘ relative rotation, the thread and pawl ,erating projection and thread on the supports,
having cooperating surfaces adapted to disengage the projection engaging the thread so as to be
the pawl from; the: thread to permit relative lon
gitudinal displacement of the supports in the
opposite: directiom, the. aforesaid element and the
expander being arranged whereby relative longi
tudinal displacement of the supports in one direc
tion engages said element by the expander for
operatively. projecting said element and relative
longitudinalv displacement of the supports in the
20 opposite direction disengages the expander from
10
screwed therealong and thus relatively longitu
dinally displace the supports ‘by relative rotation
thereof, relative longitudinal displacementof the
supports in one direction engaging the aforesaid 15
element by the expander for operatively project
ing said element, relative longitudinal displace
ment of the supports in the opposite direction
disengaging the expander from the aforesaid ele
ment to'permit return of said element to inoper 20
said element to permit return of said element to ative position, and cooperating abutments on the
inoperative position, and means for frictionally supports for limiting their relative longitudinal
holding one of the supports against rotation.
_ displacement in one direction,'the thread being
arranged whereby that threaded movement of
10. In a well tool, a support adapted for incor
the projection along the thread which causes rel 25
25 poration in a well string, a support slidable rel
ative to the ?rst mentioned support, an element ative longitudinal displacement of the supports
on one of said supports adapted for projection in said last mentioned direction terminates before
30
to position de?ning operative position of the tool,‘
the cooperating abutments engage. -
an expander carried by the other support, a coop
the projection engaging the thread so as to be
12. In a latch'for relatively longitudinally dis
placeable elements of a well tool of that type in 30
which a member is operatively or inoperatively
screwed therealong and thus relatively longitu
dinally displace thesupports by relative rotation
thereof, relative longitudinal displacement of the
supports in one. direction engaging the aforesaid
of said elements; comprising a cooperating pro
jection and thread on said elements, the pro
jection engaging the thread so as to be screwed 35
erating projection and thread on the supports,
positioned by relative longitudinal displacement
element by the expander i'or operatively project- ' therealong and thus relatively longitudinally dis
ing said element, relative longitudinal displace
place said‘ elements by relative rotation thereof,
ment of the supports in the opposite direction . and cooperating abutments on said elements for
limiting their relative longitudinal displacement
disengaging the expander from the aforesaid ele
ment to permit return of said element to inopera- ' in one direction, the thread being arranged
tive position, and cooperating. abutments on the whereby that threaded movement of the projec
supports‘for limiting'their relative longitudinal. tion along the thread which causes relative lon
displacement in the last mentioned direction, the gitudinal'displacement of .said elements in said
' thread .being arranged whereby that threaded last mentioned direction terminates before the
movement of the projection along the thread
which causes relative longitudinal displacement -
cooperating abutments engage.
»
IDRIS THOMAS.
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